All , I was trying to read some code which is generated from the jd-gui. It looks like below.
public class agrPullingAgentStudy
{
private static final String PGPR_ID = "agrPullingAgentStudy";
private static Timer m_tmStudy = null;
private static Timer m_tmNonStop = null;
private static Timer m_tmRemove = null;
private static String m_szManual = "";
private static String m_szProcRule = "";
private static String m_szExecHosp = "";
private static HashMap<String, HashMap> m_hRemoteAll = new HashMap();
private static HashMap<String, String> m_hProcRule = null;
private static int m_nImageAfterMins = -120;
private static boolean m_bDoProcess = false;
private static Date m_dAliveDT = new Date();
private static final String LINE_SEP = System.getProperty("line.separator");
....
private class dcmStudySchedule
extends TimerTask
{
public void run()
{
String FUN_ID = "runStudySchedule";
StringBuffer szBuffer = new StringBuffer();
agrPullingAgentStudy.access$002(new Date());
...
}
....
agrPullingAgentStudy.access$402(agrPullingAgentStudy.m_szExecHosp.substring(0, agrPullingAgentStudy.m_szExecHosp.length() - 1));
...
}
}
The class agrPullingAgentStudy include an inner class named dcmStudySchedule. and in the inner class.
What I can not understand is the access$xxx which I already knew it is because if the inner class tried to access the outer class members then the generated code will user access$xxx to represent this kind of code. I just want to know if there is any workaround to fix this issue. Or How can I understand this code? Thanks.
Following snippet will produce your decompiled source.
import java.util.Date;
import java.util.TimerTask;
public class agrPullingAgentStudy {
private static Date m_dAliveDT = new Date();
private class dcmStudySchedule extends TimerTask {
public void run() {
m_dAliveDT = new Date();
}
}
}
To understand the agrPullingAgentStudy.access$002(new Date()) it's helpful to do some investigation on the bytecode level.
First compile the source javac agrPullingAgentStudy .java. It generates two *.class files. agrPullingAgentStudy.class and agrPullingAgentStudy$dcmStudySchedule.class. (ok no surprice till now).
To access the variable m_dAliveDT from class dcmStudySchedule the compiler generates a synthetic method in agrPullingAgentStudy. The signature is static Date access$002(Date var0).
How do come to this conclusion? ... Simple: using javap.
javap -c -v agrPullingAgentStudy.class
reveals the generated bytecode
static java.util.Date access$002(java.util.Date);
descriptor: (Ljava/util/Date;)Ljava/util/Date;
flags: ACC_STATIC, ACC_SYNTHETIC
Code:
stack=2, locals=1, args_size=1
0: aload_0
1: dup
2: putstatic #1 // Field m_dAliveDT:Ljava/util/Date;
5: areturn
The #1 refer to the index in the constant pool (will also be shown by the above javap command)
Constant pool:
#1 = Fieldref #5.#21 // agrPullingAgentStudy.m_dAliveDT:Ljava/util/Date;
...
As Java source it would look like
static Date access$002(Date d) {
m_dAliveDT = d; // putstatic #1
return d; // areturn
}